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1121988 = 223719237
BaseRepresentation
bin100010001111011000100
32010000002010
410101323010
5241400423
640014220
712352050
oct4217304
92100063
101121988
116a6a6a
12461370
133038ca
14212c60
15172693
hex111ec4

1121988 has 72 divisors (see below), whose sum is σ = 3243072. Its totient is φ = 295488.

The previous prime is 1121987. The next prime is 1121993. The reversal of 1121988 is 8891211.

1121988 is an undulating number in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121987) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30306 + ... + 30342.

21121988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1121988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1621536).

1121988 is an abundant number, since it is smaller than the sum of its proper divisors (2121084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1121988 is a wasteful number, since it uses less digits than its factorization.

1121988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89 (or 68 counting only the distinct ones).

The product of its digits is 1152, while the sum is 30.

The square root of 1121988 is about 1059.2393497222. The cubic root of 1121988 is about 103.9112902317.

The spelling of 1121988 in words is "one million, one hundred twenty-one thousand, nine hundred eighty-eight".

Divisors: 1 2 3 4 6 7 12 14 19 21 28 37 38 42 57 74 76 84 111 114 133 148 222 228 259 266 361 399 444 518 532 703 722 777 798 1036 1083 1406 1444 1554 1596 2109 2166 2527 2812 3108 4218 4332 4921 5054 7581 8436 9842 10108 13357 14763 15162 19684 26714 29526 30324 40071 53428 59052 80142 93499 160284 186998 280497 373996 560994 1121988